| Date: | 23–29 July |
| Edition: | 25th (ATP) 8th (ITF) |
| Category: | ATP Challenger Tour ITF Women's Circuit |
| Location: | Granby, Canada |
| Prize Money: | $100,000 (ATP) $60,000 (ITF) |
| Champms: |  Peter Polansky |
| Champws: |  Julia Glushko |
| Champmd: |  Alex Lawson /  Li Zhe |
| Champwd: |  Ellen Perez / Arina Rodionova |
| Main Name: | Challenger de Granby |
The 2018 Challenger Banque Nationale de Granby was a professional tennis tournament played on outdoor hard courts. It was the twenty-fifth (ATP) and eighth (ITF) editions of the tournament and was part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Granby, Canada, on 23–29 July 2018.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 France | Pierre-Hugues Herbert | 76 | 1 | |
| Australia | ||||
| Canada | Peter Polansky | 122 | 3 | |
| Matthias Bachinger | 163 | 4 | ||
 United Kingdom | Liam Broady | 177 | 5 | |
 Slovakia | Norbert Gombos | 181 | 6 | |
| Canada | Filip Peliwo | 205 | 7 | |
| United States | Mitchell Krueger | 216 | 8 |
The following players received wildcards into the singles main draw:
Alexis Galarneau Pavel Krainik Samuel Monette Benjamin SigouinThe following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Jacob Grills| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Australia | Arina Rodionova | 142 | 1 | |
 Czech Republic | Marie Bouzková | 167 | 2 | |
| Canada | Bianca Andreescu | 185 | 3 | |
| United States | Francesca Di Lorenzo | 196 | 4 | |
| Israel | Julia Glushko | 211 | 5 | |
| Australia | Ellen Perez | 252 | 6 | |
| United States | Maria Sanchez | 271 | 7 | |
| Canada | Katherine Sebov | 276 | 8 |
The following players received a wildcard into the singles main draw:
Isabelle Boulais Jada Bui Leylah Annie Fernandez Tiffany LagardeThe following players received entry from the qualifying draw:
Freya Christie
Nagi Hanatani Samantha Murray Akiko OmaeSee main article: 2018 Challenger Banque Nationale de Granby – Men's singles.
Peter Polansky def. Ugo Humbert 6–4, 1–6, 6–2See main article: 2018 Challenger Banque Nationale de Granby – Women's singles.
Julia Glushko def. Arina Rodionova 6–4, 6–3See main article: 2018 Challenger Banque Nationale de Granby – Men's doubles.
Alex Lawson / Li Zhe def. JC Aragone / Liam Broady 7–6(7–2), 6–3.See main article: 2018 Challenger Banque Nationale de Granby – Women's doubles.
Ellen Perez / Arina Rodionova def. Erika Sema / Aiko Yoshitomi, 7–5, 6–4
